<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" type="text/css" href ="css/mycss.css">
    <style>
        p {color: blueviolet; text-align: center}
    </style>
</head>
<body>
<!--内联样式-->
<!--内部样式表-->
<!--外部样式表-->
<!--浏览器默认样式-->
<p style="color: green">这是一个段落。</p>

</body>
</html>